Celery, shallots and potatoes peel and roughly dice. Heat 10 g butter in a pot. Fry celery, potatoes and shallots for 2-3 minutes, then add stock and cream. Cover and simmer for about 30 minutes.
Cut the pretzel breadstick very diagonally into thin slices, spread thinly with the remaining butter on both sides and place in portions in a pan. Fry until golden brown while turning. Remove and let cool.
Wash the parsley and remove the leaves. Wash the dill, shake dry and pluck the flags. Wash salmon, dab dry and cut into cubes. Heat the oil in a pan. Fry the salmon for 2-3 minutes while turning.
Season with salt, pepper and some lemon juice.
Add the parsley and half of the dill to the soup and puree it finely in a blender (the soup will be greener than with a hand blender). Bring the soup briefly to the boil again. Stir crème fraiche until smooth.
Season soup with salt, pepper and nutmeg and arrange in deep plates. Place salmon in the middle and garnish with the remaining dill and crème fraîche. Add bread.